Rescue divers have searched the last known location of the missing man,off Elliot Heads,but have found no sign of him.Credit:File photo
The initial search area covered about 100 nautical miles off the Bundaberg coast but has now been extended to 350 nautical miles,Senior Constable Mark Gardiner said.
"We have a helicopter up in the air doing a search along the shoreline,"he said.
"At this stage,conditions are very favourable for a search.
"As the days progress,we will have our search assets spreading further out."
The 38-year-old man was returning from an overnight trip with two mates when police believe he decided to have one last descent into the water.
He has been described as a competent diver and spear fisherman.
Rescue divers have searched the last known location of the missing man,but have found no sign of him.